单项选择题

The average(arithmetic mean)of 3different positive integers is equal to the average of 5、7、8、9 and 11．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.

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单项选择题

（）

A. if the quantity in Column A is greater;
B.if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.

单项选择题

An identification code read from left to right consists of 2 digits，a dash，3 digits，a dash，and then 4 digits．Each digit can be any number from 0 through 9.（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.